The pcm monitors fuel requirements through sensors so it knows how much fuel is needed to keep the motor running under different demands depending on what or how the driver is driving the car.the pcm grounds the injector circuit while supplying power to the injector all the time the key is on.when the pcm grounds the injector,it opens it allowing fuel to enter cylinder to be burnt for the on time(open injector) that is required for the demand on the motor.
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